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在嵌入式平台上实现多媒体通信时,多业务间对有限的运算能力资源的竞争将导致语音通信质量的严重下降。为了解决这一问题,该文提出了利用语音数据流的短时和长时抖动性对其通信质量进行评价的方法,对多种CPU资源分配方案的性能进行了研究,提出了一种能较好的保证语音通信质量的方案,实现了支持语音、静态图像、短信和白板等数据业务并发的手持多媒体通信终端。与其他方案相比,该方案语音数据流的长时抖动性降低了33%。实验证明:通过优先保证实时通信所需要的CPU资源,终端能提供更好质量的多媒体通信。
When realizing the multimedia communication on the embedded platform, the competition among limited resources of the computing power among multiple services will lead to the serious decline of the pronunciation communication quality. In order to solve this problem, this paper proposes a method to evaluate the communication quality by using short-term and long-term jitter of voice data stream, and studies the performance of various CPU resource allocation schemes. Good program to ensure the quality of voice communications, to achieve support for voice, still images, text messaging and whiteboard data services such as handheld concurrent multimedia communications terminal. Compared with other schemes, the long-term jitter of the scheme voice data stream is reduced by 33%. Experiments show that: by giving priority to ensuring the real-time communication CPU resources required, the terminal can provide better quality multimedia communications.